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Derivative Instruments and Hedging Activities, Changes in AOCIL, Net of Tax, Related to Interest Rate Swaps (Details) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 03, 2019
Apr. 27, 2018
May 03, 2019
Apr. 27, 2018
Changes in AOCIL, net of tax, related to interest rate swaps [Roll Forward]        
Balance $ 628,618 $ 615,625 $ 581,781 [1] $ 544,507
Other comprehensive loss before reclassifications     (4,934)  
Amounts reclassified from AOCIL     (32)  
Other comprehensive (loss) income, net of tax (2,220) 3,254 (4,966) 8,680
Balance 648,023 640,381 648,023 640,381
Accumulated Other Comprehensive Income (Loss) [Member]        
Changes in AOCIL, net of tax, related to interest rate swaps [Roll Forward]        
Balance 1,939 1,197 4,685 (4,229)
Other comprehensive (loss) income, net of tax (2,220) 3,254 (4,966) 8,680
Balance $ (281) $ 4,451 $ (281) $ 4,451
[1] This Condensed Consolidated Balance Sheet has been derived from the audited Consolidated Balance Sheet as of August 3, 2018, as filed with the Securities and Exchange Commission in the Company's Annual Report on Form 10-K for the fiscal year ended August 3, 2018.